A light emitting diode (LED) with a melanopic emission spectrum can comprise a primary light source and a phosphor. The primary light source can comprise an emission spectrum comprising a first peak centered at a wavelength from 480 nm to 500 nm. The phosphor, when excited, can comprise an emission spectrum with a second peak centered at a wavelength from 640 nm to 750 nm, and the intensity of the first peak is greater than the intensity of the second peak. A light emitting apparatus can comprise a first LED with a traditional white light emission spectrum, and a second LED with a melanopic emission spectrum. The light emitted from the apparatus can comprise chromaticity coordinates, in the CIE 1931 color space diagram using the 196410° Supplementary Standard Observer, that are within a one-step MacAdam ellipse from the black body locus with chromaticity coordinate x from 0.34 to 0.45.
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1. A light emitting apparatus, comprising: a first light emitting diode (LED) with an emission spectrum comprising a corrected color temperature from 3000 K to 4000 K; and a second LED with a melanopic emission spectrum comprising: a first peak centered at a wavelength from 480 nm to 500 nm; and a second peak centered at a wavelength from 640 nm to 750 nm; wherein the intensity of the first peak is greater than the intensity of the second peak; wherein: light is emitted from the light emitting apparatus comprising light from the first and second LEDs, and the emitted light comprises: chromaticity coordinates (x,y), in the CIE 1931 color space diagram using the 1964 10° Supplementary Standard Observer, that are within a one-step MacAdam ellipse from the black body locus in the range of chromaticity coordinate x from 0.34 to 0.45; a cyanosis observation index (COI) less than 3.3; and a color rendering index (CRI) greater than 80.
2. The light emitting apparatus of claim 1 , wherein: the light emitted from the light emitting apparatus comprising light from the first and second LEDs, and the emitted light comprises chromaticity coordinates (x,y), in the CIE 1931 color space diagram using the 1964 10° Supplementary Standard Observer, that are within a region bounded by the four (x,y) coordinates (0.367, 0.358), (0.373, 0.387), (0.390, 0.372), (0.401, 0.404).
3. The light emitting apparatus of claim 1 , wherein: the light emitted from the light emitting apparatus comprising light from the first and second LEDs, and the emitted light comprises chromaticity coordinates (x,y), in the CIE 1931 color space diagram using the 1964 10° Supplementary Standard Observer, that are within a region bounded by the four (x,y) coordinates (0.389, 0.370), (0.399, 0.402), (0.415, 0.382), (0.430, 0.415).
4. The light emitting apparatus of claim 1 , wherein: the light emitted from the light emitting apparatus comprising light from the first and second LEDs, and the emitted light comprises chromaticity coordinates (x,y), in the CIE 1931 color space diagram using the 1964 10° Supplementary Standard Observer, that are within a region bounded by the four (x,y) coordinates (0.415, 0.382), (0.437, 0.389), (0.430, 0.416), (0.456, 0.426).
5. The light emitting apparatus of claim 1 , wherein: the light emitted from the light emitting apparatus comprising light from the first and second LEDs, and the emitted light comprises chromaticity coordinates (x,y), in the CIE 1931 color space diagram using the 1964 10° Supplementary Standard Observer, that are within a region bounded by the four (x,y) coordinates (0.437, 0.389), (0.456, 0.426), (0.481, 0.432), (0.459, 0.394).
6. The light emitting apparatus of claim 1 , wherein: chromaticity coordinates (x,y) of the first light emitting diode (LED), in the CIE 1931 color space diagram using the 1964 10° Supplementary Standard Observer, comprise x from 0.40 to 0.42, and y from 0.38 to 0.40; and chromaticity coordinates (x,y) of the second LED, in the CIE 1931 color space diagram using the 1964 10° Supplementary Standard Observer, comprise x from 0.22 to 0.43, and y from 0.34 to 0.47.
7. The light emitting apparatus of claim 1 , wherein: chromaticity coordinates (x,y) of the first light emitting diode (LED), in the CIE 1931 color space diagram using the 1964 10° Supplementary Standard Observer, are within the ANSI 3500 K Bin; and chromaticity coordinates (x,y) of the second LED, in the CIE 1931 color space diagram using the 1964 10° Supplementary Standard Observer, comprise x from 0.22 to 0.43, and y from 0.34 to 0.47.
8. The light emitting apparatus of claim 1 , wherein: chromaticity coordinates (x,y) of the first light emitting diode (LED), in the CIE 1931 color space diagram using the 1931 2° Standard Observer, are within the ANSI 3500 K Bin; and chromaticity coordinates (x,y) of the second LED, in the CIE 1931 color space diagram using the 1931 2° Standard Observer, comprise x from 0.23 to 0.45, and y from 0.28 to 0.39.
9. The light emitting apparatus of claim 1 , wherein: the second light emitting diode (LED) comprises a primary light source and a phosphor, and wherein: the primary light source has an emission spectrum comprising a peak centered at a wavelength from 480 nm to 500 nm; and the phosphor has an emission spectrum, when excited by the light from the primary light source, comprising a peak centered at a wavelength from 640 nm to 750 nm.
10. The light emitting apparatus of claim 1 , wherein: the second light emitting diode (LED) comprises a primary light source and a phosphor, and wherein: chromaticity coordinates (x,y) of the emission spectrum from the primary light source in the second LED, in the CIE 1931 color space diagram using the 1964 10° Supplementary Standard Observer, comprise x from 0.06 to 0.08, and y from 0.36 to 0.53; and chromaticity coordinates (x,y) of the emission spectrum from the phosphor in the second LED, in the CIE 1931 color space diagram using the 1964 10° Supplementary Standard Observer, comprise x from 0.55 to 0.68, and y from 0.31 to 0.4.
11. The light emitting apparatus of claim 1 , wherein: chromaticity coordinates (x,y) of the second light emitting diode (LED), in the CIE 1931 color space diagram, shift in the negative x direction and the positive y direction from the chromaticity coordinates using the 1931 2° Standard Observer to the chromaticity coordinates using the 1964 10° Supplementary Standard Observer.
12. The light emitting apparatus of claim 11 , wherein: the shift in the chromaticity coordinates (x,y) of the second light emitting diode (LED) between the chromaticity coordinates using the 1931 2° Standard Observer and the chromaticity coordinates using the 1964 10° Supplementary Standard Observer, in the CIE 1931 color space diagram, comprise a shift in the x-coordinate from −0.025 to −0.01, and a shift in the y-coordinate from 0.04 to 0.09.
13. The light emitting apparatus of claim 11 , wherein: the shift in the chromaticity coordinates (x,y) of the second light emitting diode (LED) between the chromaticity coordinates using the 1931 2° Standard Observer and the chromaticity coordinates using the 1964 10° Supplementary Standard Observer, in the CIE 1931 color space diagram, has a magnitude greater than 0.04.
14. The light emitting apparatus of claim 1 , wherein: the chromaticity coordinates (x,y) of the second light emitting diode (LED), in the CIE 1931 color space diagram, are below the black body locus using the 1931 2° Standard Observer and above the black body locus using the 1964 10° Supplementary Standard Observer.
15. The light emitting apparatus of claim 1 , wherein: the spectrum of the light that is emitted from the light emitting apparatus comprising light from the first and second light emitting diodes (LEDs) further comprises a global maximum in power density at a wavelength from 480 nm to 500 nm.
16. The light emitting apparatus of claim 1 , wherein: the spectrum of the light that is emitted from the light emitting apparatus comprising light from the first and second light emitting diodes (LEDs) is strongly absorbed by melanopsin and satisfies proper circadian regulation in humans.
17. The light emitting apparatus of claim 1 , wherein: the light emitted from the light emitting apparatus comprises a first intensity of light from the first LED and a second intensity of light from the second LED; and a ratio of the first intensity to the second intensity is configured such that a color rendering index (CRI) of the light emitted from the light emitting apparatus is greater than 80 and the melanopic lux equivalent (MLE) is greater than 0.5.
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February 8, 2019
January 4, 2022
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